Grizzly.



E. W. PAGET & N. L. RABER. GRIZZLY.

APPLICATION FILED MAR.11,1914.

1,117,897, Patented Nov. 17, 1914,

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EDMUND W. PAGET, 0F PORTLAND, AND NATHAN L. RABER, 0F CORVALLIS, OREGON.

GRIZZLY.

Application filed March 11, 1914.

To all whom it may concern:

Be it known that we, EDMUND WV. Paonr and NATHAN L. RABER, citizens of the United States, the former residing at Portland, in the county of Multnomah and State of Oregon, and the latter residing at Corvallis, in the county of Benton and State of Oregon, have invented a new and Improved Grizzly, of which the following is a full, clear, and exact description.

Our invention relates to a grate structure, known under the name of Grizzly in the mining industry; and the object thereof is to provide a simple, strong and efficient grizzly in which the gap between the grizzly bars is adjustable, and which gap is adapted to create a suction on the fluid flowing over the said grizzly.

l/Ve obtain this object by the mechanism conveniently illustrated in the accompany ing drawings forming part of the specification, in which similar characters of reference indicate corresponding parts in all the views and wherein:

Figure 1 is a plan of a grizzly embodying our invention; Fig. 2 is a section on line 2-2, Fig. 1; Figs. 3 and 4 are a. face and end elevation respectively of a washer whereby the bars of the grizzly are maintained in proper position; and Figs. 5 and 6 are a face and end elevation respectively of the washer whereby the size of the gap between the bars can be adjusted.

Referring to the drawings, 7 represents the bars of the grizzly, which in cross-section have the shape of an equilateral trapezoid, and preferably formed of steel. The

grizzly formed bythe bars has at the top thereof the large bases of all of said bars. The bars are spaced from each other by means of steel washers 8, which. washers in vertical cross-section have the shape of an equilateral triangle. The base of said washers, when the washers are engaged between the bars, is made toabe flush with the bottom of the grizzly, formed by the narrower ends of said bars; while the upper or sharp edge of said washers is preferably rounded so as to reduce the resistance to flow on the top of the grizzly, also interference with'material passing over the grizzly, and to avoid agitation. The bars 7 and washers 8 are provided with apertures through which a bolt 9 is made to pass and whereby said bars and Specification of Letters Patent.

Patented Nov. 17, 1914. Serial no.s24,o40.

washers are bound together to form a section of a grizzly.

A washer 10 is fitted on to the bolt 9 between the bar and the washer 8. Said washers are preferably formed of copper and are of uniform thickness. They have an end slot 11 whereby they can be easily fitted on to the bolt between the same and the washer 8 without removing the bars from the bolts; and by means of said washers the gap 12 between the bars can be varied by tightening the nut 13 of the bolt 9. The washers'S help to maintain the bars 7 in proper position on the bolts 9 so that the gap between the bars diverges symmetrically toward the bottom of the grizzly, while the washer 10 helps to vary the size of the gap.

The grizzly so-formed is placed so as to have the gap or longitudinal opening 12 substantially parallel to the direction of flow of fluid, thereby forming no obstruction and avoiding any disturbance to the medium carried by the fluid. The material carried by the fluid will necessarily follow the flow and is caught in the downward draft of water caused by the divergency of the gap toward the bottom of the grizzly. This downward suction or draft is caused by the expansion of the gap toward the bottom; and thus the downward flow of fluid through said gaps is increased due to said suction, and whereby the material carried by said fluid passes therebetween with less resistance.

By means of the washers the openings in the grizzly may be so regulated that the material may be screened to certain sizes, and its volume may be more easily distributed along the length of the grizzly. These adjustments of the izzly bars through the medium of the was rs 1O permit of a degree of concentration of the material; and the taper in the gaps formed by the grizzly bars prevents clogging of the openings due to the other precious metals, iron and sand, for the reason that the fine metals, together with part of the water, may be made to pass through the grizzly openings by means of adjustment of the bars of the grizzly, as stated.

In conclusion, we may say that our adjustable grizzly overcomes all the agitation of fluid and material carried thereby, for the reason that the openings are parallel to the flow of fluid. Furthermore, the formation of said openings so as to create a suction toward the bottom of the grizzly increases greatly the elficiency of the same.

Having thus described our invention, we claim as new and desire to secure by Letters Patent: i

In a grizzly, a lurality of bars disposed parallel to each 0t er, each of said bars having in cross-section the shape of an equilateral trapezoid; washers between said bars for maintaining the same in proper position and spacing said bars from each other, said washers having in cross-section the shape of an equilateral triangle; bolts engaging said bars and washers whereby the same are bound together;.and end slotted washers of uniform thickness adapted to fit between the bars and the first mentioned washers without removing the bolts from the bars and washers whereby the spacing between the bars can be varied through the medium of said bolts, said bars having their larger base at the top of the grizzly, and said first mentioned washers having their bases at the bottom of said grizzly.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

EDMUND W. PAGET.

Witnesses:

C. CAnoNAN, P. F. HAMPSON.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

NATHAN L. BABER.

Witnesses:

H. B. AULD, EMERY J. Nnwron. 

